If you notice any of the above, it's wise to have a local HVAC technician inspect your system. They can pinpoint problems and recommend whether repair or full HVAC replacement is the best course of action.external site Not all states will require local HVAC technicians to be licensed and insured.(Image: https://live.staticflickr.com/1827/28091674397_d4508a4fdf_b.jpg) In Florida, in particular, service providers do require an up-to-date license. Review Florida’s complete list of HVAC policies and regulations for more information.